diff --git a/Cargo.lock b/Cargo.lock
index b51221d..76d8fe4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -34,33 +34,9 @@ name = "coreutils"
 version = "0.0.1"
 dependencies = [
  "arg 0.1.0",
- "exit-no-std",
  "sysexits",
 ]
 
-[[package]]
-name = "exit-no-std"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4a608ccc67fac78c1916aa88ad75d6f6a3e353521844abce906c22a45d161d99"
-dependencies = [
- "libc",
- "pc-ints",
- "winapi",
-]
-
-[[package]]
-name = "libc"
-version = "0.2.138"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db6d7e329c562c5dfab7a46a2afabc8b987ab9a4834c9d1ca04dc54c1546cef8"
-
-[[package]]
-name = "pc-ints"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "422b0cc3a966f6e0987d2f948c234585bd917a1f16df1470e60c56ad6de2c085"
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.47"
@@ -116,25 +92,3 @@ name = "unicode-width"
 version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
-
-[[package]]
-name = "winapi"
-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
-dependencies = [
- "winapi-i686-pc-windows-gnu",
- "winapi-x86_64-pc-windows-gnu",
-]
-
-[[package]]
-name = "winapi-i686-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-
-[[package]]
-name = "winapi-x86_64-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/arg/Cargo.lock b/arg/Cargo.lock
index 257fed8..5e976e0 100644
--- a/arg/Cargo.lock
+++ b/arg/Cargo.lock
@@ -2,6 +2,13 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "arg"
+version = "0.1.0"
+dependencies = [
+ "arg 0.3.1",
+]
+
 [[package]]
 name = "arg"
 version = "0.3.1"
@@ -22,13 +29,6 @@ dependencies = [
  "tabwriter",
 ]
 
-[[package]]
-name = "arg-dynamic"
-version = "0.1.0"
-dependencies = [
- "arg",
-]
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.47"
diff --git a/arg/src/lib.rs b/arg/src/lib.rs
index 32873cb..13564b5 100644
--- a/arg/src/lib.rs
+++ b/arg/src/lib.rs
@@ -1 +1,20 @@
+// Copyright (c) 2022 YAC
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+/* This file is part of YAC coreutils.
+ *
+ * YAC coreutils is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ * 
+ * YAC coreutils is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see https://www.gnu.org/licenses/.
+ */
+
 pub use arg::*;
diff --git a/build.sh b/build.sh
index 449b4aa..c01e26c 100755
--- a/build.sh
+++ b/build.sh
@@ -1,3 +1,24 @@
 #!/bin/sh
 
-cargo build --release -Z build-std=std,panic_abort -Z build-std-features=panic_immediate_abort --target x86_64-unknown-linux-gnu
+# Copyright (c) 2022 YAC
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# This file is part of YAC coreutils.
+#
+# YAC coreutils is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+# 
+# YAC coreutils is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see https://www.gnu.org/licenses/.
+
+cargo build --release \
+	-Z build-std=std,panic_abort \
+	-Z  build-std-features=panic_immediate_abort \
+	--target x86_64-unknown-linux-gnu
diff --git a/src/cat.rs b/src/cat.rs
index a5b3d8a..dd1e646 100644
--- a/src/cat.rs
+++ b/src/cat.rs
@@ -1,6 +1,22 @@
-// Copyright (c) 2022 Emma Tebibyte
+// Copyright (c) 2022 YAC
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
+/* This file is part of YAC coreutils.
+ *
+ * YAC coreutils is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ * 
+ * YAC coreutils is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see https://www.gnu.org/licenses/.
+ */
+
 use std::env;
 use std::fs::{File, read_to_string};
 use std::io;